| abstract |
The present invention provides a cover glass and a light-emitting device for a light-emitting diode package which can suppress degradation of transmittance characteristics when used for a long period of time.nn n n A cover glass for a light-emitting diode package, which has the following basic composition in terms of mass% of oxide: SiO 2 55 to 80%, Al 2 O 3 0.5 to 15%, and B 2 O 3 5 to 25 %, Li 2 O 0~7%, Na 2 O 0~15%, K 2 O 0~10% (however, Li 2 O+Na 2 O+K 2 O 2~20%), SnO 2 0~0.1 %, Fe 2 O 3 0.001~0.1%; and, substantially does not contain As 2 O 3 , Sb 2 O 3 and PbO, and the average thermal expansion coefficient at a temperature range of 0 to 300 ° C is 45 to 70 × 10 - 7 / ° C. |